[Telemetry] Change default BattOr benchmark chrome tracing categories to be rail.

tools/perf/benchmarks/battor.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from core import perf_benchmark
+from telemetry.timeline import chrome_trace_category_filter
 from telemetry.web_perf import timeline_based_measurement
 import page_sets
 from telemetry import benchmark
 
 
 # TODO(rnephew): Remove BattOr naming from all benchmarks once the BattOr tests
 # are the primary means of benchmarking power.
 class _BattOrBenchmark(perf_benchmark.PerfBenchmark):
 
   def CreateTimelineBasedMeasurementOptions(self):
-    options = timeline_based_measurement.Options()
+    options = timeline_based_measurement.Options(
+        chrome_trace_category_filter.ChromeTraceCategoryFilter())
+    options.config.chrome_trace_config.category_filter.AddFilterString('rail')
     options.config.enable_battor_trace = True
     options.config.enable_chrome_trace = True
     options.config.enable_atrace_trace = True
     options.config.atrace_config.categories = ['sched']
     options.config.enable_cpu_trace = True
-    options.config.chrome_trace_config.SetDefaultOverheadFilter()
     options.SetTimelineBasedMetrics(['powerMetric', 'clockSyncLatencyMetric'])
     return options
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
     # Only run if BattOr is detected.
     if not possible_browser.platform.HasBattOrConnected():
       return True
 
     # Galaxy S5s have problems with running system health metrics.
@@ skipping 76 matching lines @@
     options = timeline_based_measurement.Options()
     options.config.enable_battor_trace = True
     options.config.enable_chrome_trace = False
     options.config.chrome_trace_config.SetDefaultOverheadFilter()
     options.SetTimelineBasedMetrics(['powerMetric', 'clockSyncLatencyMetric'])
     return options
 
   @classmethod
   def Name(cls):
     return 'battor.power_cases_no_chrome_trace'